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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '94d3772e34a355c1ee3221fe97c5c31e7293a6482b216282967f4527c0ccd69f' 
  AND token = 'aqgWB7rhJZ24+beTAA57YPrj22v50liAx3KJOKqy67c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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