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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eb8f0aa8f40dddb8ea22416b47d6f253854133aebe78f848af4f774205dea66a' 
  AND token = 'qxataRZPqOT+DGOzcDzJ3JwwHqB6xZvm5j1CprJ2jbA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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