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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eaa80b13ae5faabbbe6bdb1ee5a1b60f04e3e254b711c347ae6f41e483ad487c' 
  AND token = 'H65JubMOftNBC6IYyRw4jt/5R0q/AcMhARlZlAwDTHQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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