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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '91ece1a041f4c247b4b81479875507266a5e90856ea129d9b45766ee4da0be6d' 
  AND token = 'IH3LTKm/lNeo1KxtLuyqv31GS9Ongb/tXaOJCtxLF+Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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