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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a65602a3184c0aa9674633d7ffb7c8999d75745f31624dbf9806920f3061d537' 
  AND token = 'KDrQ/rPC64HQ/m6439h9oXdnB1I2iyqNf0OYf9epvn0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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