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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '92a4fbdba7e08a12da0d295b5bc7a4e05cb60d54a027ab0b6d8a3c9f679d2c48' 
  AND token = '15a3gqeuPU7+MmCHHeCQa7Eg2ZIRsB3unG7TV4wzjCI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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