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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ecd8c897e7bd15ad23028c2d9bb3567ff41068da84e985adbd4f87ef2cb092bc' 
  AND token = 'qFI7W/LABVHfaHBh1TtAEsB0kc3jeFpLq/j5/BJfEWw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00059

JSON explain

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