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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bd95c8e74b08d7ac34087010594c5a33832aed231b637a4e050937350cbb15ac' 
  AND token = 'Oz/SOqf7EMB6w+hlq0qF/5i82szomSY0R0qywCnByQI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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