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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '00e439db87d8f1574a7723d9d692a2ce26575f7d84ca0cd0cbe439baf8cd9a13' 
  AND token = 'JYJKa8Eh4Lh8r4c3a7oHRGsk8/SK19yDetBhj1Ht5Ro=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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