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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4930af638c62dfad5a3b1e6a2d458d851d0c586af568b2615db3aedf9914b37e' 
  AND token = '/GWdwOBdgWKFhF+y36E7NCuBjGOSJ5FW6Sx/dgiSq4s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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