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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c1a094db7ab7dbbaaa384ca4c82dd02f4d8e3263822c54054eec73b4bf44fa4e' 
  AND token = 'vPON7sUKJvWGqBBFNhcsDrLKYUz54WVatSxZ5vK69sk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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