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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '755373cc192947ad26c3e564636226433093ccb8c155ab402f9d64bc9d0a190f' 
  AND token = '54dNv4nouRP/Nqc7TZ6qLiqMJCAjHnbK2GcK7EnKrq8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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