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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b0ad5a9a3f908901acb13e4649412ec98a704af9c8805b06a6fdd0bfa903b0a6' 
  AND token = '43d4RJcJN3yNjsWIr8SP4ccn1GyHEzDiv4IkJyn1AWk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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