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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '32086c42a413a12099de365a1c11357b158743e038ff38c075d99892a89598b6' 
  AND token = 'hyc+OhYOtzmqADehk1I26QX4PM0eh5ehquWoVWTcP6o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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