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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2cdd301ba9c7729af2fe1e89a330d9729e637e9c71730868b9a59d25d106d708' 
  AND token = 'fzFYMw4Dzd6wSFOeOPoSfjnsh6wL+vxvvLmv2paX0bQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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