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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '20cbe8c0c417a5813cdad0132d5924c1b15bfa89126d3800dd8d317bb844833d' 
  AND token = 'K3pWdssvUM8YBzMEX+Hxx/0AO3B5JOaA7Dm9sRvxZ6k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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