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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9af5b0aee1ff84cd4908def2a0cd497e65ad8cd702cd4232271cf265d4e311db' 
  AND token = 's6cSMOTtODzcbrhxpy6VnR41SqP0/K2kgSMHscGq6zU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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