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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e0959d59b9b0de116a436929c2b8c91e2ef1b25af67b16b2f225039c91c1fa79' 
  AND token = 'jCahp+g58LDN0QBaq50V157qSNMXjYgY/vHfLWh5N1I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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