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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dcd95e8cf0c44a6b2bde81c4e9e50e055666ba1713e871a6cddfdf152254bfc2' 
  AND token = '2cW/VaQYlwDJErwSRpRTLUAjhqzIbPSB2a5llBs/jaI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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