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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '522ff78a2f841706b43fbbbd6a726acce8d87a3024eb3332434e0aa9df7d99df' 
  AND token = 'bDU7t7+GQfeCZxtRuSal3W/2ztTBKqAVblcyygMFA4U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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