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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a3413ed840e60d4d1d1d719ab3954c547e0ceed9308d087ce404cd610137c8cb' 
  AND token = 'BGnqDgZ3WOcJifGzNrb300KxrAQfT6FdRVkl+IyU2ac=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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