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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '79f37b41cb7fbfaeeae52f8caff8a7e7cb7c683c9a590f17bdd250052405d0dd' 
  AND token = '92+6oqqZjUPP/BrUDlto4+o0qN01GBAccvbQPUdjx98=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00057

JSON explain

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