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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd0e69061ebf897186690c9f9a4f0165f2b2718c3a69385795a319a29ab55fb2f' 
  AND token = '8zux2BbdFjjJ+QrVMPvW9Qd+Ya15Wq87Uz1WErlxzU8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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