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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6fd4ba0da96390b1974cfcc0a5f266cd0cb13813cd9a91b9f61e43743d5badf3' 
  AND token = 'weIjr5iF7BCj2mlZs72D5p/b+1QWKMX+ji9MbPOvWkw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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