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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cb7963e0a048d4f62f276ca110f72c370b6be1b17055a0002d747da856dd59a8' 
  AND token = 'wGy9k1qskwShdWKZjZMp/r9ykZ39avtEiEeZ4OqaM8o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00061

JSON explain

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