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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3b0fa2be6302f1ba07387282977833e69aea1f8bafb9d63b30c243a85331cd2e' 
  AND token = 'M4AU5RqaODeedQqYNiNn+qb0uPrnYEj++MrNnbdblXk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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