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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '79cb58d17d4e9466df05202118a52a0dadf56604aeddefe91ddfaddfc4894f44' 
  AND token = 'QVQ6JYPH+quS9Yk/q9kJT8e8edcegJifVSQUGm19J6Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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