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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9e73ac92edfa68ec6dfa961c22020636821f5212da76cd3a63f497fa290b690e' 
  AND token = 'uvapOkeOI92foSWHqHAsXf/Ge5f5VZMOkieMuHyb+08=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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