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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6a4a1215aa6f60e53eaf8d95f908166c21ee6a033a1d0ad0552002e209e661e6' 
  AND token = 'XWfe/Ay/guajEVfdsJ8XQbI7TLYLYQLod4O733njIT0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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