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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '017b571d67d225664c000d94287d831516dbada5a722ccb4bb5c348ed318011a' 
  AND token = '7vOVpcOs1rg0EE85xusR9Iacu5lk1iIAig1of+cj7ss=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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