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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f1c943c6b17c1a92325b60b4f2d75e94774f93f4a50b688d58ab95eace638f8c' 
  AND token = 'oOc0BSdRclyWEqvvY56tUNht3bSCqjUTJBbSQ66gWGg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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