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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9e2438e060d9e08e865b4d699009d29bbb84f2790d444e18bebcffb410a6a51e' 
  AND token = 'e11GrZsxqK0JGrxAsV6QTXm6jsAzKh+9v/e5AU+15x8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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