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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e67f97d72326d8992da0f77a865501e09b993f9936dae2862f24f02b5b4633f8' 
  AND token = 'Dva6cFYz29W89y0h4DAZefPkqsbnO+RM4xm6YOlPcgA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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