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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fc28a8004b84ddd73105530aa2a424fa51f6fde4d2f3ea225aa2177cd495bff2' 
  AND token = 'oUw5DCR6psl13jqaQBlhmbr53dlZFEv5b5xMO5feHgI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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