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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '92a757fbb4277734833ae034797c4d500a5895ae3064295df8ba18cec91563d0' 
  AND token = 'lwAxZYAtP7mxnvQeDIVol3NiB/RCB7soQ7wVO3j5UMg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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