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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '66d0ba19cc4192ba03eb4ba9f12b23884862744ac5f89ae68da2292155cb8190' 
  AND token = 'WwEG44Bj1sCrLnVyRtyOy/xm1/0usl2FWXO7Wyae/BY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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