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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'af776d15e873a83e6ced6bb2a9959ceea9e5e2ec7e0f6c26bf6641cea2d36a2d' 
  AND token = 'i/wRZgt4qeX53+N+rBHHNZQwFeJRIEoi+PLFKrw4Ljs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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