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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8c32b544376c172cdfd9865c5107acce3c8cded9fa3ce586bb188da4231a6c0d' 
  AND token = 'LzUYOs+2ppcXIG8Ksk7MsMBd9LaheXRk6V7G6yK2e8c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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