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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '05ff0db5cbc23ce0cd1ab67a7b3051c1c8d1bdb6815146228592ddd5e6fd6fbb' 
  AND token = 'Oac5ueGMc/tarGsBidQF3vYI9KWpddNYX3P52xkqU54=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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