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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '17ba3eea7f81f366c533c40eecead0b7519b3b246e81845105ac2657a47ccf4f' 
  AND token = 'y285M9TSkSLB+9CMtEj+sYkk0oe+bZwuf6ck3uWg46E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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