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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5bc0e68d78a565d0810eeb64b0d93abc3b707b156851b45e1109f365b7022a30' 
  AND token = '7OU6SRzG8HHX/HdOvlm32V+GcDIgic4XaNgElJujpLQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}