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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '61c0731ce24b11a3d7b54ec614ea685f5b0615e3066dc98feab63e4de0b7919b' 
  AND token = 'd8a/pxyTUP88vZTuCQ/hspSWPviyjeQ5GazB3TfwGKI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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