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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '85ee6874f9ad6c2b43c93fd93c666944eba9c92d47e88c57519876c2d16d3c47' 
  AND token = 'AzHVWy71qZICTFqWGZuQX3amEcmwhCqqMjucmsywCo8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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