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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ed4408d7074e36e6c8ab827e61e2195cc425d1591f9b30e0798afe6ecf47cb95' 
  AND token = 'sNulvRuyRgz9EBneobYdIMCe2gVRROMCXTjbR51wiJc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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