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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd04df951eff5927de24e0fe5cb0bc37d8217e274d997db63ddef95cb72f07348' 
  AND token = 'cw/DF5JzcndTbdgxqiX1kJb3EDU0ESPekXWoHybfOAo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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