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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '602090ff04fe000035011037ef055cf5a69a6e51a1f88a61b1130e1bb15f9243' 
  AND token = 'qzwdM8mbpIqZD7LQ0X7F9ltpQcvyrh9I5Gg5gtWpmM0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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