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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5c36d90c3a80d324a4f2cea58d7796c5094fbee0276a9bb1079006001cf2b59d' 
  AND token = '5PX7Ji9b+4sppUAswrtUaNqvdYn9ASdQf1Y2gWqpYU4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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