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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eee0db893e515777049e2b34f7d3ad7102bc49e9bb60d7bdd8f4a6eb57d8ef65' 
  AND token = 'zswxbFhleB1jPjgNn/UqClPKrEWtfYr+DjAtKT+4i3o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00059

JSON explain

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