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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '960af5a76a1ff24305adcda9c44ba46a8bb4775969b88a4bdb07e48c81106adf' 
  AND token = '39hJn8/U548Lk3WpCujeUliAb8iqOngTkbAR2PlF1iQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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