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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b3711b88c2199f321db801d04ec20317efeeb3c8afd0aa7077156259d9464740' 
  AND token = 'S8fH7c2Q3A5cg2EGn6WkZqHHLzmvn8vE5pNHjN1KgmU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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