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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e88639e406a828de7af826ba64fe6b5bce1d52a78131023d488446a6b7e8d85d' 
  AND token = 'eIeLMcGasQiumuJ7u0KfphK2CZe/Pv6Mr8YwIz6rVyw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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