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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '27e19b84d793a7c25988f36bbe0e3ce6fac15297e43d0bbc16271dabd04acb9c' 
  AND token = 'oladg5oMoHVAzA4s9A3SzLjPhX5TFUMklW+MnL2uZhw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00106

JSON explain

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