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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9d6c68b37a998e61c5264bc50670d0b6ecf65c32b0a0769fb83c7afdd7c8c83f' 
  AND token = '4GSZo0Fhb6GwN6Ay+vo5b8MW+jko2Jb0oH+xSnsP9gk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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