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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '31b6c61dfedf62dd4987410d7630a00e6de7a960ed47a54e82e49b6c6e0a00ab' 
  AND token = '4e8YyY4RLt1Mws39DpfmSmZgYyMjAiE039w7eubsKVA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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