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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2adbb7611fb1cfd042a9ccd25e59806575ba6ec9129a223dcfb9e90dc28632b5' 
  AND token = 'Xf2PqA7r+Cl0Rb0Je3rYVyxMBIb89R01SD181Pif+MU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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