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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '864ba1f7bdf5b3ecd31e42a1b2a71e81cecc81fc084a0ca3443d2a6fc0a870c3' 
  AND token = '8SXajEcnNqp9NIOZW/TzF7rtaeDZET2LnoeqQeOpIAk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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