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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a520bf6e75f5b6bb4a50cc393fcc947af097b28d2241d2fc592f47d4e05ac378' 
  AND token = 'EsxPea5EHdHfuz6CTPunzLuLgpNZTBv/XUUO5G2TBfk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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