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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ef6612ad9d430882bb8a0597206b9e373e837e20396d817d518c1f16cd09e2ab' 
  AND token = 'YfuFDXRtoDOWJQbq2Lq8Sb8b+KGbtpirBcRzJqV8rMU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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