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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a1f447021c3d88a7d35f137e111a791185eb258d4be0fc6308c31314b5b15973' 
  AND token = '7m69A9CpC8YvcM8mBW0Q3Ibd3wWBLTVLe4bPmKYln94=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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