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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2ca90239b0580ba6cc5621ef821d96928097980862e7c0302714dda8e7076ea0' 
  AND token = 'bsKKd4eP/V0wcpmMcC1pigwJCflxCAi7DGjP+IJPRSo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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