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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '135f05833c7d54ee81df7904c5f9f7be63a63b0d005425b5dcc40d0fe1cbd5e1' 
  AND token = '/y9rS2d9SftSMqE7VW+rprq+OgjHU/sxVGItfRxT8/8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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