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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6d096febf63f59a21b55d71b8ae41ffccf04cc4f0ccd5a22afd7aa8dfce9324e' 
  AND token = 'AoCWzRQ8W54NxA8Nd/0tFiF16ziN0DURK02V8Vmwp2Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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