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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3fd6905872e30727a320cfcd0e2c53084de0edb14a84bf6336ebbdc6654f9afd' 
  AND token = '7TtKoAax9eROUIgoqg6G/IR9o9dwFvgnNQ7aZba8ElI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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