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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0231a1cf30887d52ddf08c348c160b2424fb60b0a519cf8bd6c7f01443c4be1f' 
  AND token = 'zgYzgkTcKc+VNZZ3fP3BSkWuVGGbVTNUXklP+hEj6o0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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