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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '886614de4b547f1fc554bff2bccff4af93ab3d05ba103d0906e6ce123f441900' 
  AND token = '+k/3JQO1ZVi4VCMRn381DMBAXkbn7+GkcE0LVJK/xgc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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