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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c98a3dcb040acc42638368b567670401b7833954f3f7d72fcde6a6ba52833f7f' 
  AND token = 'EU8v3pmnZZS/7WtIW0DStALF1ZXPexjxoB1U1+eXMp4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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