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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a8ea9ad8c7b4615997e44f8c5ac81c02c119ed40ace71b2fb05572d341ae9046' 
  AND token = 'riQk8N8DvSAtjMvKD7kkEcR4cx7YgcY6dh+dGuLspUQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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