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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f4a0a3ac51f0c916da91d0cf13f1e70047b1768fa56952b17f6cc570f998a20c' 
  AND token = 'ow7MCriSG4ais+Bsy4GQKJw78HeJ2sXZHmwvSjfYKVs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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