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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0a4d632578accdb6185e1b4c52ec6ed901c08d699b9a529c2df23561f9e4be73' 
  AND token = 'cOwYv5iZzzojC9rSgC2llX+7Lt1WB0fQatNTaplL7hA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00071

JSON explain

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